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Bug 565120: Deal with the case where a source lies outside of a destination surface. r=jrmuizel

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This commit is contained in:
Bas Schouten 2010-06-19 16:32:50 +02:00
parent fdc01fa365
commit fee8140b17
1 changed files with 29 additions and 2 deletions
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31
gfx/cairo/cairo/src/cairo-d2d-surface.cpp
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@ -632,6 +632,15 @@ static void _d2d_snapshot_detached(cairo_surface_t *surface)
cairo_surface_destroy(surface);
}
/**
* This function will calculate the part of srcSurf which will possibly be used within
* the boundaries of d2dsurf given the current transformation mat. This is used to
* determine what the minimal part of a surface is that needs to be uploaded.
*
* \param d2dsurf D2D surface
* \param srcSurf Source surface for operation
* \param mat Transformation matrix applied to source
*/
static void
_cairo_d2d_calculate_visible_rect(cairo_d2d_surface_t *d2dsurf, cairo_image_surface_t *srcSurf,
cairo_matrix_t *mat,
@ -667,7 +676,13 @@ _cairo_d2d_calculate_visible_rect(cairo_d2d_surface_t *d2dsurf, cairo_image_surf
/* Calculate the offsets into the source image and the width of the part required */
if ((UINT32)srcSurf->width > maxSize) {
*x = (int)MAX(0, floor(leftMost));
*width = (unsigned int)MIN(MAX(0, ceil(rightMost - *x)), srcSurf->width - *x);
/* Ensure that we get atleast 1 column of pixels as source, this will make EXTEND_PAD work */
if (*x < srcSurf->width) {
*width = (unsigned int)MIN(MAX(1, ceil(rightMost - *x)), srcSurf->width - *x);
} else {
*x = srcSurf->width - 1;
*width = 1;
}
} else {
*x = 0;
*width = srcSurf->width;
@ -675,7 +690,13 @@ _cairo_d2d_calculate_visible_rect(cairo_d2d_surface_t *d2dsurf, cairo_image_surf
if ((UINT32)srcSurf->height > maxSize) {
*y = (int)MAX(0, floor(topMost));
*height = (unsigned int)MIN(MAX(0, ceil(bottomMost - *y)), srcSurf->height - *y);
/* Ensure that we get atleast 1 row of pixels as source, this will make EXTEND_PAD work */
if (*y < srcSurf->height) {
*height = (unsigned int)MIN(MAX(1, ceil(bottomMost - *y)), srcSurf->height - *y);
} else {
*y = srcSurf->height - 1;
*height = 1;
}
} else {
*y = 0;
*height = srcSurf->height;
@ -882,6 +903,12 @@ _cairo_d2d_create_brush_for_pattern(cairo_d2d_surface_t *d2dsurf,
UINT32 maxSize = d2dsurf->rt->GetMaximumBitmapSize() - 2;
if ((UINT32)srcSurf->width > maxSize || (UINT32)srcSurf->height > maxSize) {
if (pattern->extend == CAIRO_EXTEND_REPEAT ||
pattern->extend == CAIRO_EXTEND_REFLECT) {
// XXX - we don't have code to deal with these yet.
return NULL;
}
/* We cannot fit this image directly into a texture, start doing tricks to draw correctly anyway. */
partial = true;